Pipe coupling



G. A. NOLL PIPE COUPLING Nov. 7, 1950 Filed larch 2'7, 1946 INVENTOR 650 m m. m

ATTORNEY UNITED STATES PATENT OFFICE This invention relates to couplings or joints for pipes and is especially suitable for joining the sections of movable pipe used for irrigation.

A primary object of my invention is to provide a simple and inexpensive joint'which is easily and quickly assembled and taken apart.

Other objects are to provide a joint which is automatically progressively tightened by increasing fluid pressure, which oifers practically no resistance to the flow of water through the pipe and in which the only part subject to wear is a cheap and easily replaced gasket.

A further object is to provide such a joint that eliminates the necessity for the use of screws. bolts or any kind of tool or clamping device to lock the pipe sections together.

Other advantages and objects of the invention will be apparent from the description thereof to follow taken in connection with the accompanying drawing in which- Figure 1 is alongitudinal sectional view showing two sections of pipe joined by a coupling embodying my invention.

Figure 2 is a cross-sectional view taken plane of the line 2-2 of Figure 1.

In the drawing, the reference numerals l and 2 designate two sections of pipe to be joined. Section I is provided with an enlarged outwardly flaring end portion 3, which end has an annular bulged-out portion 4 and terminates in a constricted outwardly curved free end or throat 5 The bulged-out portion 4 provides an interior circumferential groove with shoulders I and I at its ends.

A resilient gasket 9, preferably of rubber and substantially V-shaped in cross-section is seated in groove 6 before the two pipe sections are assembled. The gasket is formed with an outer wall iii and an inwardly flaring wall or skirt ll, leaving an annular space l2 between said walls. The wall III snugly engages the wall of the groove and tapers to a thin free edge engaging the shoulder I and the skirt ll flares inwardly into the pipe section i and tapers to a thin free edge. Adjacent its free edge, the skirt is formed with an annular inwardly extending rib IS. The portion of the gasket connecting the outer and inner walls is thickened as at It and seats against the shoulder 0.

The diameter of the pipe section 2 is less than the diameter of the throat portion but is slightly greater than the diameter of the opening in the skirt H at its free end. The section 2 is formed with an annular exterior circumferential groove I! at a point remote from its end It,

on the and the telescoping of the adjacent ends of said pipe sections and the-insertion of the end of section 2 into and through the skirt ll causes said skirt to flex at its inner free end and causes the rib 13 to slip into the groove l5 thereby interlocking the pipe sections together and providing a tight seal where the skirt frictionally engages the surface of the section 2.

When the sections are in this interlocking and sealing position, the inner end ii of section 2 is positioned close to the shoulder I! at the inner end of the enlarged portion 3 of section I, and the wall of said inner end is in alignment with the straight cylindrical wall of section I so that there is practically no obstruction to the flow of water through the pipe. The water passing around the inner end It of section 2 will impinge against the outer wall of skirt II and press said skirt against the outer surface of section 2 forcing the rib is into the groove l5 and jamming the thickened portion ll of the gasket against the shoulder 8 andthe inner wall III of the gasket against the wall of the annular groove 6.

It will be seen that my improved joint may be assembled and made water tight simply by pushing the end of section 2 through the opening in skirt H until the rib l3 slips into the groove IS in said pipe section and that the sections may be separated by simply pulling out section 2 when the fluid pressure is removed from the gasket. The shape of the gasket 9 with its inwardly flaring skirt ii and rib I3 not only tightens the joint by friction when the section 2 is inserted through oil. Furthermore, the space between the throat 5 and section 2 permits some angularity between sections of the pipe line to allow it to conform to irregularities in the ground surfaces and such angularity does not impair its tightness.

Changes in details of construction might be made without departing from the principle of the invention and I desire to be limited only by r the state of the prior art and the appended claims.

WhatIclaimis: i. A gasket for a pipe Joint comprising an annular body substantially v-shaped in crosssection having flaring walls, oneor which tapers to a thin edg and has an inwardly extending circumferential rib on its inner surface adjacent said thin edge.

A pipe joint comprising inner and outer 5816800191118 pipe sections, the outer section havins an rged end portion formed with an interior circumferential groove, the inner section having a recess in its outer surface adjacent its inner end, a resilient gasket approximately V-shaped in cross-section seated in the said circumferential groove of said outer section and having inwardly extending walls the inner edge portion of one of which is spaced from the inner surface 01' the outer pipe section and is adapted to frictionally engage the inner telescoped end or said inner REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PA'I'ENTS Number Name Date 343,138 Mcl-Iugh June 1, 1886 2,259,453 Beyer et a1. Oct. 21, 1941 2,278,074 Hauf Mar. 31, 1942 2,355,407 Wyss Aug. 8, 194% 

